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Full text of "The manufacture and properties of iron and steel"

THE HISTORY AND SHAPE OF THE TEST-PIECE.
333
are classed as "wide and thin" and as having a tensile strength between 54,000 and 64,000 pounds, while Table XVI-R gives only 72 bars. This arises from the fact that some of the 8.3 bars were shorter than 13 feet or longer than 30 feet, and that there was not a sufficient number of any one size to warrant combining them. The elongation in 12 inches and the reduction of area will be independent of the length of the bar, so that each of the divisions is again summarized in the true averages, A, B, 0 and D. The influence of width will be found by comparing A with J?, and C with D, and the influence of thickness by comparing A with Of and B with D.
The average elongation in 12 inches of the wider bars is about 3 per cent, better than the narrow pieces, while the narrow bars are superior in reduction of area. The thick bars give one per cent, more elongation, but the difference in thickness does not have a marked effect upon the reduction of area., By analyzing'the individual records of the table, it will be seen that corroborative evidence is at hand of the correctness of the averages. There are seven comparisons for width, viz., 1 to 6, 2 to 7, 3 to 8, 4 to 9, 10 to 15, 11 to; 16, 12 to 17; -there are seven comparisons for thickness, viz., 2 to 10, 3: to 11; 4 to 12, 6 to 14, 7 to 15, 8 to 16,
9 to 17;          i           j          i       .' I          \
i          i
;     TABLE XVl-S. Properties of Evie-Bars, Classified According to Length.
A v< >
0 ft
Za
tu
M
gj IH P"_H
gd
s d d
s
2
rtS
Oft
1-
5
 A
41 102 215 245 145
82
10 to 12 19 to 16 17 to 20 21 to 25 26 to 80 81 to 85
11,8 14.8 18.6 22.9 280 83.1
59880 59830 69770 (50380. 69520 59900
85240 85460 85540 85460. 85810 85470
18.07 18.05 16.58 15.76 15.87 14.17
84.68 85.76 85.04 85.87 36.36 84.73
46.95 48.48 48.87 47.72 49.25 49.85
880___[all lengths
59980
35440
85.41
48.42
In every case the wider and the thicker pieces gave the greater elongation in 12 inches. The narrow pieces gave the better reduction of area in every case except one, and in this instance the dif-